Source : Webster's Revised Unabridged Dictionary (1913)

Bloody hand \Blood"y hand`\
   1. A hand stained with the blood of a deer, which, in the old
      forest laws of England, was sufficient evidence of a man's
      trespass in the forest against venison. --Jacob.

   2. (Her.) A red hand, as in the arms of Ulster, which is now
      the distinguishing mark of a baronet of the United
      Kingdom.